US 2013/0154382 A1Published application

Wireless power feeder and wireless power transmission system

AssigneeTDK Corporation

InventorsHitoyoshi Kurata, Masami Itakura

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Abstract

A wireless power feeder has a power feed coil that performs a power feed by a non-contact method to a wireless power receiver having a power receive coil. A power source section supplies AC power to the power feed coil. A control section calculates a power transmission efficiency from the power feed coil to the power receive coil to control a power source section so that the power supply to the power feed coil is in a stopped or intermittent state when the power transmission efficiency is lower than a first determination reference value; is in a first power supply state when the power transmission efficiency is equal to or higher than the first determination reference value and lower than a larger second determination reference value; and is in a second power supply state when the power transmission efficiency is equal to or higher than the second determination reference value.

Claims18

Dependent claims

A wireless power feeder which performs power feed by a non-contact method to a wireless power receiver having a power receive coil,

the wireless power feeder comprising:
a power feed coil to perform power feed from the power feed coil to the power receive coil on the basis of a magnetic coupling between the power feed coil and the power receive coil a power source section supplying AC power to the power feed coil;
and
a control section calculating a power transmission efficiency from the power feed coil to the power receive coil to control the power source section according to the power transmission efficiency, wherein
the control section
controls the power source section so that the power supply to the power feed coil is in a stopped state or in an intermittent supply state when the power transmission efficiency is lower than a first determination reference value,
controls the power source section so that the power supply to the power feed coil is in a first power supply state when the power transmission efficiency is equal to or higher than the first determination reference value and lower than a second determination reference value, the second determination reference value being larger than the first determination reference value, and
controls the power source section so that the power supply to the power feed coil is in a second power supply state when the power transmission efficiency is equal to or higher than the second determination reference value.

5 more elements

Dependencies are inferred from the claim text.

Facts

Application: 13/328,590Filed 16 Dec 2011
Published: 20 Jun 2013
Term ends: Not estimatedThe source records don’t support an estimate.

Classification5 codes

H02J 50/12
Using inductive coupling: of the resonant type
H02J 50/80
Circuit arrangements or systems for wireless supply or distribution of electric power: involving the exchange of data, concerning supply or…
H02J 50/90
Circuit arrangements or systems for wireless supply or distribution of electric power: involving detection or optimisation of position, e.g. alignment
H02J 50/60
Circuit arrangements or systems for wireless supply or distribution of electric power: responsive to the presence of foreign objects, e.g.…

Family

US 8,928,182 B2Related patent
US 2013/0154382 A1This patent

From the US filing history. Foreign family members aren’t listed.

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